VariableELASTIC_PORT
DescriptionELASTIC_PORT Environment Variable

In order to use rsyslog as a log shipper, ElasticSearch is needed. Set the post for ElasticSearch bulk endpoint with this option, usually to port 9200.

ini files
BOOTSTRAP_HOST_ID=1
DIRECTORY=/var/humio/data
HUMIO_PORT=8080
ELASTIC_PORT=9200
...